More than a dozen mumps cases have been confirmed at Indiana University Bloomington, and most of the cases are associated with a fraternity, officials told IndyStar on Wednesday.

University spokesman Chuck Carney told IndyStar that all 16 cases are students. The status of the cases is unclear. Nine of the cases are linked to a fraternity, which Carney declined to name due to privacy.

Carney noted that the fraternity-related cases doesn't mean that they are all members of the frat. The affected students could have been anyone who had been at the fraternity house.

The number of mumps cases has been increasing since February, when the first case of mumps on IU Bloomington's campus this school year was identified.

Pediatrician Charles Goodman holds a dose of the measles-mumps-rubella, or MMR, vaccine at his practice in Northridge, Calif., on Jan. 29, 2015.(Photo: Damian Dovarganes / AP)

The Monroe County Health Department held a clinic at the fraternity on April 4 and offered free doses of the MMR (measles, mumps, and rubella) vaccine.

"That helps keep the possibility down if they’ve been exposed," Carney said. "We had about 58 percent of the frat that took part of it.

Carney said officials with the county health department, the Indiana Department of Health and the Centers for Disease Control and Prevention are discussing possible next steps.

People with mumps are infectious from two days before until five days after the onset of symptoms, the university has said. Symptoms of mumps include fever, muscle aches, headache and loss of appetite and generally last two or more days.